(Not quite a "game" per se, but boy do they love it.) My dad began taking our dogs Katie and Sugar out with him to put corn in the deer feeders. It just so happened that he'd do this every day at around 4. Now, if he runs late, Katie sits at his feet and growls, and as soon as she can get him out of his chair she runs to find Sugar so that she can come along (Sugar doesn't have quite the internal clock that Katie has). We have to be careful when we mention the D-E-E-R or Katie thinks we're going back outside. Trouble is, she's beginning to learn the spelling, too.